Consists of works, correspondence, documents, photographs, memorabilia, family papers, scrapbooks, and an autograph book (1880) of Charles Grosvenor Osgood, reflecting his role as one of Woodrow Wilson's original preceptors (1905) and the importance of the preceptorial system at Princeton. The collection contains typed manuscripts of Osgood's lectures on Milton, Spenser, and Samuel Johnson, addresses and note cards, and professional correspondence.

The American Whig-Cliosophic Society (1941-present) is a literary, political and debating society which has had an important impact on the lives of generations of Princeton students. It provides students with both social alternatives and an opportunity to develop skills not emphasized by the University curriculum. The contents of the initial group of records were acquired between 1941 and 1993 in agreements between Princeton University and the American Whig-Cliosophic Society. The library initially cataloged some of these records into the P Collection. Subsequently, an attempt was made to organize some of these records in 1975.

Organized competitive athletics appeared on the Princeton campus in the 1850s and 1860s through the formation of intramural and intercollegiate athletics clubs which evolved over the ensuing century into the modern collegiate athletic system. The collection consists of scrapbooks and sets of clippings about sports and athletes at Princeton.

The Class Records consist of a diverse set of materials documenting the history and activities of Princeton University classes during their time as undergraduates and as alumni. In the collection are correspondence, newsletters, publications, photographs, and memorabilia, all of which pertain to a particular Princeton University graduating class and its members.

Consists of 486 scrapbooks of playbills covering not only theater but also opera, ballet, and music.

The collection consists of autobiographical material and other works such as manuscripts of books, sermon outlines, prayers, articles, and essays; correspondence with family during the time Lowrie was in Europe (especially letters to his mother), but also correspondence with friends and colleagues, particularly Howard A. Johnson, a long-time friend and executor of his estate; photographs of religious art presumably used for his books; documents including certificates and agreements with book publishers; printed matter including reprints of published works; and writings and documents created by Howard A. Johnson and other Kierkegaard scholars.